LVDT (Linear Variable Differential Transformer) sensor, full name linear variable differential transformer, is a high-precision sensor that converts mechanical displacement into usable electrical signals. The LVDT Position Sensor HTD-300-6 plays a vital role in the operation of the unit. This article will introduce in detail the application of HTD-300-6 LVDT sensor in control circuits, its importance, and the problems that may cause if it fails.

Applications in control circuits

1. Valve adjustment command: When the unit is running, the DEH (Distributed Control System) system issues valve adjustment commands as needed.

2. Signal conversion and transmission: These commands are output through the VP card of the controller and transmitted to the MOOG valve. The MOOG valve converts the electrical signal into oil pressure regulation.

3. Mechanical displacement feedback: The action of the MOOG valve causes changes in the amount of high-pressure anti-fuel oil in the oil motor, which in turn changes the valve stem position of the oil motor. This mechanical displacement is converted into an electrical signal through the LVDT Position Sensor HTD-300-6 and fed back to the VP card of the controller.

4. Closed-loop control: In the VP card, by setting up a PID (proportional-integral-derivative) controller, the electrical signal is adjusted according to the feedback signal of the LVDT sensor, and then sent to the MOOG valve to form a closed loop to ensure precise control of the valve position.

Importance

1. Precise feedback: LVDT Position Sensor HTD-300-6 provides precise mechanical position feedback, which is the key to achieving closed-loop control.

2. System stability: Its stability directly affects the operational stability of the entire unit, and any deviation may lead to control errors.

3. Safety guarantee: In the event of a fault, the LVDT sensors can promptly feedback abnormal signals to help the system make corresponding safety responses.

Consequences of failure

1. Pressure fluctuation: If the LVDT Position Sensor HTD-300-6 fails, it may cause the main steam pressure to fluctuate.

2. Load mutation: The unit load may suddenly change due to inaccurate valve control, affecting the stable output of the unit.

3. Shaft system vibration: Sensor failure may lead to increased shaft system vibration, increased mechanical wear, and shortened equipment life.

4. Noise jump: The unit noise may suddenly increase due to improper control, affecting the working environment and may indicate more serious problems.

LVDT Position Sensor HTD-300-6 plays a vital role in the control circuit of the unit. It not only ensures the accuracy of valve adjustment, but also improves the stability and safety of the entire system through closed-loop control. The failure of any LVDT sensor may lead to serious consequences. Therefore, maintenance and regular inspection of the LVDT Position Sensor HTD-300-6 are necessary measures to ensure the stable operation of the unit. With the development of technology, LVDT sensors will be more widely used and their importance in industrial automation and power industries will be further enhanced.